There was an accessibility issue with the previous icons that we used
the same "checked" shape just in different colours for different
meanings. New icons added for the new statuses:
* partial - a warning icon for the overall status column that the user
has only some policies accepted, not all.
* pending - that we did not hear yet from the user - whcih is different
from a declined policy.
The patch introduces a new property of a policy document called
"Agreement style". It allows the admin to define if the policy should be
accepted together with all others on the consent page (legacy and
default behaviour) or on its page before the consent page is reached
(the new optional behaviour).
